说明：  C++ GUI Qt4（第二版），非常经典的Qt学习书籍，书分Qt基础、Qt中级，Qt高级和附录四大部分，知识点分解详细易懂，实例众多，是Qt入门学习不可多得的教材之一。
(C + + GUI QT4 (the Second Edition) is a very classic QT learning book. The book is divided into four parts: QT foundation, QT intermediate, QT advanced and appendix. The knowledge points are detailed and easy to understand, and there are many examples. It is one of the rare teaching materials for QT introductory learning.)